Tricarboxylate transport protein,mitochondrial,also known as tricarboxylate carrier protein and citrate transport protein (CTP),is a protein that in humans is encoded by the SLC25A1 gene. It is mapped to 22q11.21. This gene encodes a member of the mitochondrial carrier subfamily of solute carrier proteins. Members of this family include nuclear-encoded transporters that translocate small metabolites across the mitochondrial membrane. This protein regulates the movement of citrate across the inner membranes of the mitochondria. Mutations in this gene have been associated with combined D-2- and L-2-hydroxyglutaric aciduria. Pseudogenes of this gene have been identified on chromosomes 7,11,16,and 19. Alternative splicing results in multiple transcript variants.